一，前言

在文章SpringBoot之简单入门中提到了，SpringBoot是内置一个tomcat容器的，但是如果要将SpringBoot部署在一个外部的tomcat，要怎么办呢？这就是本篇文章的目的了。

在文章SpringBoot之整合Mybatis（增，改，删）中我们实现了mybatis的增，改，删功能，那么，我们就将文章中的示例工程部署到一个外部的tomcat。

二，继承SpringBootServletInitializer并重写configure方法

　　代码：

package com.zcz;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;

@SpringBootApplication

public class LearnSpringBootWithMybatis2Application extends SpringBootServletInitializer{

    public static void main(String[] args) {

        SpringApplication.run(LearnSpringBootWithMybatis2Application.class, args);

    }

    @Override

    protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {

        // TODO Auto-generated method stub

//        return super.configure(builder);

        return builder.sources(this.getClass());

    }

}

三，修改pom.xml禁用springboot内置的tomcat，并将打包方式改为war

　　添加配置：

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-tomcat</artifactId>

            <!-- provided 表明该包只在编译和测试的时候使用，去除默认的tomcat -->

            <scope>provided</scope>

        </dependency>

　　将jar改为war

<packaging>war</packaging>

　　修改完成后，整体的pom.xml文件为：

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.zcz</groupId>

    <artifactId>learnSpringBootWithMybatis2</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <packaging>war</packaging>

    <name>learnSpringBootWithMybatis2</name>

    <description>learnSpringBootWithMybatis</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.0.5.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.mybatis.spring.boot</groupId>

            <artifactId>mybatis-spring-boot-starter</artifactId>

            <version>1.3.2</version>

        </dependency>

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <scope>runtime</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-tomcat</artifactId>

            <!-- provided 表明该包只在编译和测试的时候使用，去除默认的tomcat -->

            <scope>provided</scope>

        </dependency>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

四，打war包　　

　　在工程上右键->Run As ->Maven clean。

　　接着右键->Run As -> Maven install。

　　然后就可以在target中看到打好的war包了

　　

五，启动tomcat

　　为了方便运行，将tomcat的webapps目录清空，将我们打好的war包，拷贝到webapps目录中，并将名称更改为ROOT.war。

　　进入tomcat的bin目录，双击startup.bat，启动tomcat。

　　糟了，出现异常了：java.lang.NoClassDefFoundError: javax/el/ELManager

　　完整的错误信息，如下：

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server version:        Apache Tomcat/7.0.85

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server built:          Feb 7 2018 18:52:33 UTC

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server number:         7.0.85.0

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Name:               Windows 8.1

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Version:            6.3

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Architecture:          amd64

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Java Home:             G:\tools\JDK8_64\jre

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Version:           1.8.0_40-b25

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Vendor:            Oracle Corporation

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_BASE:         G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_HOME:         G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.util.logging.config.file=G:\myservices\tomcat-7.0.85-springbootmybatis\conf\logging.properties

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Xms2048m

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Xmx2048m

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Xss1024K

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -XX:MetaspaceSize=20m

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -XX:MaxMetaspaceSize=512m

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djdk.tls.ephemeralDHKeySize=2048

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dignore.endorsed.dirs=

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.base=G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.home=G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.io.tmpdir=G:\myservices\tomcat-7.0.85-springbootmybatis\temp

十月 09, 2018 3:27:53 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent

信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: G:\tools\JDK8_64\jre\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Python\Python365\Scripts\;C:\Python\Python365\;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Prog

ram Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Java\jdk-10\bin;C:\Program Files\Java\jdk-10;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;.

十月 09, 2018 3:27:53 下午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["http-bio-80"]

十月 09, 2018 3:27:53 下午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["ajp-bio-8009"]

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.Catalina load

信息: Initialization processed in 1256 ms

十月 09, 2018 3:27:53 下午 org.apache.catalina.core.StandardService startInternal

信息: Starting service Catalina

十月 09, 2018 3:27:53 下午 org.apache.catalina.core.StandardEngine startInternal

信息: Starting Servlet Engine: Apache Tomcat/7.0.85

十月 09, 2018 3:27:53 下午 org.apache.catalina.startup.HostConfig deployWAR

信息: Deploying web application archive G:\myservices\tomcat-7.0.85-springbootmybatis\webapps\ROOT.war

十月 09, 2018 3:27:57 下午 org.apache.catalina.startup.TldConfig execute

信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.

  .   ____          _            __ _ _

 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::        (v2.0.5.RELEASE)

2018-10-09 15:28:00.126  INFO 3216 --- [ost-startStop-1] z.LearnSpringBootWithMybatis2Application : Starting LearnSpringBootWithMybatis2Application on idea-PC with PID 3216 (G:\myservices\tomcat-7.0.85-springbootmybatis\webapps\ROOT\WEB-INF\classes started by zongwu in G:\myservices\tomcat-7.0.85-springbootmybatis\bin)

2018-10-09 15:28:00.131  INFO 3216 --- [ost-startStop-1] z.LearnSpringBootWithMybatis2Application : The following profiles are active: online

2018-10-09 15:28:00.190  INFO 3216 --- [ost-startStop-1] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@1b9aacaf: startup date [Tue Oct 09 15:28:00 CST 2018]; root of context hierarchy

2018-10-09 15:28:02.598  INFO 3216 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2411 ms

2018-10-09 15:28:03.640  INFO 3216 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]

2018-10-09 15:28:03.642  INFO 3216 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]

2018-10-09 15:28:03.643  INFO 3216 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'errorPageFilter' to: [/*]

2018-10-09 15:28:03.643  INFO 3216 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]

2018-10-09 15:28:03.644  INFO 3216 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]

2018-10-09 15:28:03.644  INFO 3216 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]

2018-10-09 15:28:04.548  WARN 3216 --- [ost-startStop-1] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultValidator' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.Be

anInstantiationException: Failed to instantiate [org.springframework.validation.beanvalidation.LocalValidatorFactoryBean]: Factory method 'defaultValidator' threw exception; nested exception is java.lang.NoClassDefFoundError: javax/el/ELManager

2018-10-09 15:28:04.567  INFO 3216 --- [ost-startStop-1] ConditionEvaluationReportLoggingListener :

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.

2018-10-09 15:28:04.580 ERROR 3216 --- [ost-startStop-1] o.s.boot.SpringApplication               : Application run failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultValidator' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.validation.beanvalidation.LocalValidatorFactoryBean]: Factory method 'defaultValidator' threw exception; nested e

xception is java.lang.NoClassDefFoundError: javax/el/ELManager

        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1247) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1096) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:535) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$141/1748549073.getObject(Unknown Source) ~[na:na]

        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:333) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:157) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:137) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:91) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:172) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5630) [catalina.jar:7.0.85]

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145) [catalina.jar:7.0.85]

        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1015) [catalina.jar:7.0.85]

        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991) [catalina.jar:7.0.85]

        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) [catalina.jar:7.0.85]

        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1127) [catalina.jar:7.0.85]

        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:2020) [catalina.jar:7.0.85]

        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_40]

        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_40]

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_40]

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_40]

        at java.lang.Thread.run(Thread.java:745) [na:1.8.0_40]

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.validation.beanvalidation.LocalValidatorFactoryBean]: Factory method 'defaultValidator' threw exception; nested exception is java.lang.NoClassDefFoundError: javax/el/ELManager

        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        ... 32 common frames omitted

Caused by: java.lang.NoClassDefFoundError: javax/el/ELManager

        at org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator.buildExpressionFactory(ResourceBundleMessageInterpolator.java:88) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]

        at org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator.<init>(ResourceBundleMessageInterpolator.java:47) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]

        at org.hibernate.validator.internal.engine.ConfigurationImpl.getDefaultMessageInterpolator(ConfigurationImpl.java:474) ~[hibernate-validator-6.0.12.Final.jar:6.0.12.Final]

        at org.springframework.boot.validation.MessageInterpolatorFactory.getObject(MessageInterpolatorFactory.java:54) ~[spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration.defaultValidator(ValidationAutoConfiguration.java:57) ~[spring-boot-autoconfigure-2.0.5.RELEASE.jar:2.0.5.RELEASE]

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_40]

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_40]

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_40]

        at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_40]

        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]

        ... 33 common frames omitted

十月 09, 2018 3:28:04 下午 org.apache.catalina.core.ContainerBase addChildInternal

严重: ContainerBase.addChild: start:

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1015)

        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991)

        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)

        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1127)

        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:2020)

        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'defaultValidator' defined in class path resource [org/springframework/boot/autoconfigure/validation/ValidationAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.validation.beanvalidation.LocalValidatorFactoryBean]: Factory method 'defaultValidator' threw exceptio

n; nested exception is java.lang.NoClassDefFoundError: javax/el/ELManager

        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:590)

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1247)

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1096)

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:535)

        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495)

        at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317)

        at org.springframework.beans.factory.support.AbstractBeanFactory$$Lambda$141/1748549073.getObject(Unknown Source)

        at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)

        at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315)

        at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)

        at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759)

        at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869)

        at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550)

        at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140)

        at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780)

        at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412)

        at org.springframework.boot.SpringApplication.run(SpringApplication.java:333)

        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:157)

        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:137)

        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:91)

        at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:172)

        at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5630)

        at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

        ... 10 more

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.validation.beanvalidation.LocalValidatorFactoryBean]: Factory method 'defaultValidator' threw exception; nested exception is java.lang.NoClassDefFoundError: javax/el/ELManager

        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)

        at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:582)

        ... 32 more

Caused by: java.lang.NoClassDefFoundError: javax/el/ELManager

        at org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator.buildExpressionFactory(ResourceBundleMessageInterpolator.java:88)

        at org.hibernate.validator.messageinterpolation.ResourceBundleMessageInterpolator.<init>(ResourceBundleMessageInterpolator.java:47)

        at org.hibernate.validator.internal.engine.ConfigurationImpl.getDefaultMessageInterpolator(ConfigurationImpl.java:474)

        at org.springframework.boot.validation.MessageInterpolatorFactory.getObject(MessageInterpolatorFactory.java:54)

        at org.springframework.boot.autoconfigure.validation.ValidationAutoConfiguration.defaultValidator(ValidationAutoConfiguration.java:57)

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:497)

        at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)

        ... 33 more

十月 09, 2018 3:28:04 下午 org.apache.catalina.startup.HostConfig deployWAR

严重: Error deploying web application archive G:\myservices\tomcat-7.0.85-springbootmybatis\webapps\ROOT.war

java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[]]

        at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1019)

        at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:991)

        at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652)

        at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:1127)

        at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:2020)

        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)

        at java.util.concurrent.FutureTask.run(FutureTask.java:266)

        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)

        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)

        at java.lang.Thread.run(Thread.java:745)

十月 09, 2018 3:28:04 下午 org.apache.catalina.startup.HostConfig deployWAR

信息: Deployment of web application archive G:\myservices\tomcat-7.0.85-springbootmybatis\webapps\ROOT.war has finished in 10,975 ms

十月 09, 2018 3:28:04 下午 org.apache.coyote.AbstractProtocol start

信息: Starting ProtocolHandler ["http-bio-80"]

十月 09, 2018 3:28:04 下午 org.apache.coyote.AbstractProtocol start

信息: Starting ProtocolHandler ["ajp-bio-8009"]

十月 09, 2018 3:28:04 下午 org.apache.catalina.startup.Catalina start

信息: Server startup in 11111 ms

　　这个问题是因为el的jar包引起的。

　　如果你是使用的idea，那么请参考文章：https://blog.csdn.net/qq_14853889/article/details/80026885

　　如果使用的是eclipse，就先查看eclipse中使用的jar包的位置：

　　

　　找到这个jar包，拷贝到tomcat的lib中。问题即可解决，启动成功控制台打印信息：

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server version:        Apache Tomcat/7.0.85

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server built:          Feb 7 2018 18:52:33 UTC

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Server number:         7.0.85.0

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Name:               Windows 8.1

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: OS Version:            6.3

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Architecture:          amd64

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Java Home:             G:\tools\JDK8_64\jre

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Version:           1.8.0_40-b25

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: JVM Vendor:            Oracle Corporation

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_BASE:         G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: CATALINA_HOME:         G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.util.logging.config.file=G:\myservices\tomcat-7.0.85-springbootmybatis\conf\logging.properties

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Xms2048m

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Xmx2048m

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Xss1024K

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -XX:MetaspaceSize=20m

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -XX:MaxMetaspaceSize=512m

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djdk.tls.ephemeralDHKeySize=2048

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dignore.endorsed.dirs=

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.base=G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Dcatalina.home=G:\myservices\tomcat-7.0.85-springbootmybatis

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.VersionLoggerListener log

信息: Command line argument: -Djava.io.tmpdir=G:\myservices\tomcat-7.0.85-springbootmybatis\temp

十月 09, 2018 3:37:57 下午 org.apache.catalina.core.AprLifecycleListener lifecycleEvent

信息: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: G:\tools\JDK8_64\jre\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\Python\Python365\Scripts\;C:\Python\Python365\;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Prog

ram Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;C:\Program Files\Java\jdk-10\bin;C:\Program Files\Java\jdk-10;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;.

十月 09, 2018 3:37:57 下午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["http-bio-80"]

十月 09, 2018 3:37:57 下午 org.apache.coyote.AbstractProtocol init

信息: Initializing ProtocolHandler ["ajp-bio-8009"]

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.Catalina load

信息: Initialization processed in 1020 ms

十月 09, 2018 3:37:57 下午 org.apache.catalina.core.StandardService startInternal

信息: Starting service Catalina

十月 09, 2018 3:37:57 下午 org.apache.catalina.core.StandardEngine startInternal

信息: Starting Servlet Engine: Apache Tomcat/7.0.85

十月 09, 2018 3:37:57 下午 org.apache.catalina.startup.HostConfig deployWAR

信息: Deploying web application archive G:\myservices\tomcat-7.0.85-springbootmybatis\webapps\ROOT.war

十月 09, 2018 3:38:00 下午 org.apache.catalina.startup.TldConfig execute

信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.

  .   ____          _            __ _ _

 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \

( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \

 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )

  '  |____| .__|_| |_|_| |_\__, | / / / /

 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::        (v2.0.5.RELEASE)

2018-10-09 15:38:02.562  INFO 8456 --- [ost-startStop-1] z.LearnSpringBootWithMybatis2Application : Starting LearnSpringBootWithMybatis2Application on idea-PC with PID 8456 (G:\myservices\tomcat-7.0.85-springbootmybatis\webapps\ROOT\WEB-INF\classes started by zongwu in G:\myservices\tomcat-7.0.85-springbootmybatis\bin)

2018-10-09 15:38:02.567  INFO 8456 --- [ost-startStop-1] z.LearnSpringBootWithMybatis2Application : The following profiles are active: online

2018-10-09 15:38:02.719  INFO 8456 --- [ost-startStop-1] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@4eb8b69d: startup date [Tue Oct 09 15:38:02 CST 2018]; root of context hierarchy

2018-10-09 15:38:05.239  INFO 8456 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2523 ms

2018-10-09 15:38:06.063  INFO 8456 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]

2018-10-09 15:38:06.067  INFO 8456 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]

2018-10-09 15:38:06.068  INFO 8456 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'errorPageFilter' to: [/*]

2018-10-09 15:38:06.069  INFO 8456 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]

2018-10-09 15:38:06.072  INFO 8456 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]

2018-10-09 15:38:06.073  INFO 8456 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]

2018-10-09 15:38:07.035  INFO 8456 --- [ost-startStop-1] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

2018-10-09 15:38:07.436  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@4eb8b69d: startup date [Tue Oct 09 15:38:02 CST 2018]; root of context hierarchy

2018-10-09 15:38:07.600  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/user/getUser]}" onto public java.util.List<com.zcz.entity.User> com.zcz.controller.UserController.getUsers()

2018-10-09 15:38:07.604  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/user/addUser]}" onto public void com.zcz.controller.UserController.addUser(javax.servlet.http.HttpServletRequest)

2018-10-09 15:38:07.605  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/user/updateUser]}" onto public void com.zcz.controller.UserController.updateUser(javax.servlet.http.HttpServletRequest)

2018-10-09 15:38:07.606  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/user/deleteUser]}" onto public void com.zcz.controller.UserController.deleteUser(javax.servlet.http.HttpServletRequest)

2018-10-09 15:38:07.607  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/user/getUserOne]}" onto public com.zcz.entity.User com.zcz.controller.UserController.getUserOne(javax.servlet.http.HttpServletRequest)

2018-10-09 15:38:07.613  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)

2018-10-09 15:38:07.620  INFO 8456 --- [ost-startStop-1] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)

2018-10-09 15:38:07.710  INFO 8456 --- [ost-startStop-1] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

2018-10-09 15:38:07.712  INFO 8456 --- [ost-startStop-1] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]

2018-10-09 15:38:08.280  INFO 8456 --- [ost-startStop-1] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup

2018-10-09 15:38:08.303  INFO 8456 --- [ost-startStop-1] o.s.j.e.a.AnnotationMBeanExporter        : Bean with name 'dataSource' has been autodetected for JMX exposure

2018-10-09 15:38:08.315  INFO 8456 --- [ost-startStop-1] o.s.j.e.a.AnnotationMBeanExporter        : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]

2018-10-09 15:38:08.342  INFO 8456 --- [ost-startStop-1] z.LearnSpringBootWithMybatis2Application : Started LearnSpringBootWithMybatis2Application in 7.66 seconds (JVM running for 12.232)

十月 09, 2018 3:38:08 下午 org.apache.catalina.startup.HostConfig deployWAR

信息: Deployment of web application archive G:\myservices\tomcat-7.0.85-springbootmybatis\webapps\ROOT.war has finished in 10,902 ms

十月 09, 2018 3:38:08 下午 org.apache.coyote.AbstractProtocol start

信息: Starting ProtocolHandler ["http-bio-80"]

十月 09, 2018 3:38:08 下午 org.apache.coyote.AbstractProtocol start

信息: Starting ProtocolHandler ["ajp-bio-8009"]

十月 09, 2018 3:38:08 下午 org.apache.catalina.startup.Catalina start

信息: Server startup in 11032 ms

　　接下来测试一下功能是否可以实现，就测试一个新增功能吧。

　　浏览器访问：http://localhost/user/addUser?name=chegnzilalala

　　查看数据库：

　　　

　　说明数据成功插入。

　　你可能会奇怪，为什么没有加8080端口，那是因为我在application.yml文件中配置了80端口，http协议默认是80端口，所以在浏览器中访问的时候就可以不加端口

server:

  port: 80

　　源代码，我已经更新到了github ： https://github.com/ZCC1/learnSpringBootWithMybatis2.git，有需要的小伙伴可以去clone

原创不易，转载请声明出处：https://www.cnblogs.com/zhangchengzi/p/9760712.html

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